Regulation of a wash column in a melt crystallization process

Chemistry: physical processes – Physical processes – Crystallization

Reexamination Certificate

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Details

C023S30500F, C134S005000, C134S013000, C134S018000, C422S245100, C422S105000, C117S068000, C117S069000

Reexamination Certificate

active

07323016

ABSTRACT:
The present invention relates to the use of an optical line detector for regulating the position of the wash front and/or of the build-up front of the crystal bed of a wash column in a melt crystallization process and a corresponding regulation method. The line detector, for example a CCD camera or a linear array of reflection probes, is arranged in such a way that optical properties of the crystal bed can be detected continuously in a region running parallel to the longitudinal axis of the wash column, this region covering the desired setpoint position of the wash front or of the build-up front.

REFERENCES:
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Derwent Abstract DE 19741307A, Apr. 1999.
U.S. Appl. No. 10/333,721, filed Jan. 24, 2003, Heilek et al.
U.S. Appl. No. 10/494,721, filed May. 6, 2004, Hammon, et al.

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